Carbon fiber-introduced high-toughness low-carbon Al2O3-C sliding plate refractory material and preparation method thereof

Abstract

The invention provides a carbon fiber-introduced high-toughness low-carbon Al2O3-C sliding plate refractory material and a preparation method thereof. The preparation method comprises the following steps: preparing the following raw materials in percentage by mass: 75 to 90 weight percent of tabular corundum, 4 to 10 weight percent of metal aluminum micro powder, 0.5 to 3 weight percent of carbon black, 0.5 to 5 weight percent of boron carbide powder, 3 to 6 weight percent of liquid phenolic resin, 0.1 to 1 weight percent of recycled short carbon fiber and 0.45 to 0.85 weight percent of organic dispersing agent; uniformly mixing the recycled short carbon fibers with an organic dispersant solution to obtain a recycled short carbon fiber mixed solution; uniformly mixing tabular corundum, metal aluminum micro powder, carbon black, boron carbide powder and liquid phenolic resin, then uniformly mixing with the recycled short carbon fiber mixed solution, performing compression molding on the obtained uniform mixture, and firing to obtain the high-toughness low-carbon Al2O3-C sliding plate refractory material. The preparation method has the advantages of simple process, uniform carbon fiber dispersion and low raw material cost, and the prepared Al2O3-C slide plate refractory material has the advantages of high strength, good toughness, excellent thermal shock resistance and oxidation resistance, low carbon content and long service life.

Description

Technical Field

[0001] This invention belongs to the field of refractory materials technology, and particularly relates to a high-strength, low-carbon Al2O3-C refractory material with carbon fiber and its preparation method. Background Technology

[0002] In continuous casting steelmaking, the sliding plate plays a crucial role in regulating the flow of molten steel, and its performance stability directly impacts production safety. Currently, the steel industry is undergoing product structure upgrades, and the large-scale production of special steels has significantly intensified the chemical corrosion and thermal oxidation of the sliding plate by molten steel, leading to failure issues such as structural cracking and void expansion. Although unburned or lightly burned sliding plate products have addressed some of the inherent defects of traditional sliding plates, there is still room for improvement in key indicators such as material strength, fracture toughness, high-temperature oxidation resistance, and corrosion resistance. In practical applications, insufficient strength and toughness have exposed defects and cracking problems. Furthermore, with the increasing market demand for clean steel quality and quantity, traditional Al2O3-C sliding plate refractory materials with high carbon content are insufficient. During use, the introduction of carbon impurities is inevitable, increasing the carbon content of the molten steel and affecting the quality of clean steel. Simultaneously, the high carbon content of Al2O3-C sliding plates does not align with the industry's development goals of "carbon reduction" and "carbon conservation." Meanwhile, the aerospace manufacturing industry generates a large amount of chopped carbon fiber waste every year. Due to size defects, this waste is difficult to reuse directly, and current mainstream recycling methods can only process it into low-value-added products, resulting in a serious waste of resources. However, after processing, it can be introduced as a "carbon source" into Al2O3-C sliding plate refractory materials, which can help improve mechanical properties and enhance high-temperature service performance in metallurgical industrial applications.

[0003] Regarding the research on using carbon fiber to prepare Al2O3-C sliding plate refractory materials, the patent technology "An aluminum-carbon sliding plate brick for steelmaking and its preparation method" (CN116675549A) produces aluminum-carbon sliding plates with good thermal shock resistance, excellent mechanical properties, and good oxidation resistance. However, the carbon fiber used is expensive, and it needs to be modified and coated before use, increasing the complexity of the process and production costs. Moreover, the carbon content in the prepared aluminum-carbon sliding plate brick matrix is ​​high. The patent technology "An unburned aluminum-carbon sliding plate with added carbon fiber and its preparation method" (CN113831111A) involves a complex carbon fiber processing process and uses carbon fibers with a large aspect ratio. This type of carbon fiber is not only expensive but also difficult to disperse. Although it can ensure stable material performance, the high cost of raw material procurement leads to a significant increase in overall production costs. At the same time, the large aspect ratio carbon fibers, which are prone to agglomeration, can cause unstable product performance. The patented technology "A carbon fiber mesh reinforced aluminum-carbon sliding plate brick and its preparation method" (CN118324500A) uses a mixture of carbon fiber mesh and chopped carbon fiber to reinforce aluminum-carbon sliding plate bricks. Although it produces aluminum-carbon sliding plate bricks with excellent mechanical properties and thermal shock resistance, it requires the introduction of various acidic metal particle catalyst precursors during carbon fiber processing, resulting in high preparation costs and complex processes. Furthermore, the sequential stacking of multiple layers of carbon fiber mesh in the matrix increases the difficulty and number of steps in the sliding plate molding process, affecting production efficiency. The patented technology "A method for improving the strength of refractory castables using recycled carbon fiber" (CN114736025A) innovatively uses recycled chopped carbon fiber in refractory castables. While it achieves advantages in environmental protection, reuse, and cost control, it requires complex processing of the carbon fiber, increasing process complexity and extending the molding and curing cycle of the castable. The recycled chopped carbon fiber only positively affects the product's room temperature performance. Summary of the Invention

[0004] To address the shortcomings of existing skateboard refractory materials, such as insufficient strength and toughness and high carbon content, this invention proposes a high-strength, low-carbon Al2O3-C skateboard refractory material incorporating carbon fibers and its preparation method. The preparation method is simple, the recycled short-cut carbon fibers are evenly dispersed, and the cost is low. The prepared Al2O3-C skateboard refractory material not only has high strength, good toughness, excellent thermal shock resistance and oxidation resistance, but also has the advantages of low carbon content and long service life.

[0005] This invention proposes a method for preparing a high-strength, high-toughness, low-carbon Al2O3-C refractory material for skateboards incorporating carbon fibers, comprising the following steps: S1. Prepare the following raw materials by weight percentage: 75-90 wt% tabular corundum, 4-10 wt% metallic aluminum powder, 0.5-3 wt% carbon black, 0.5-5 wt% boron carbide powder, 3-6 wt% liquid phenolic resin, 0.1-1 wt% recycled short-cut carbon fiber, and 0.45-0.85 wt% organic dispersant; S2. Mix the recycled short-cut carbon fibers with the organic dispersant solution to obtain a mixed solution in which the recycled short-cut carbon fibers are fully dispersed. S3. After mixing the tabular corundum, metallic aluminum micro powder, carbon black, boron carbide powder and liquid phenolic resin, mix them with the mixed solution described in step S2. The resulting uniform mixture is pressed and sintered to obtain the high-strength, tough, low-carbon Al2O3-C sliding plate refractory material.

[0006] In this invention, recycled short-cut carbon fibers have advantages such as easy dispersion, low coefficient of thermal expansion, and high tensile strength.

[0007] Preferably, the Al2O3 content of the tabular corundum is greater than 98 wt%; Preferably, the tabular alumina includes tabular alumina particles and tabular alumina fine powder, wherein the particle size of the tabular alumina particles is 0.048-2 mm, and the particle size of the tabular alumina fine powder is less than 0.048 mm. Preferably, the mass ratio of the tabular corundum particles to the tabular corundum fine powder is 2:1-4:1.

[0008] Preferably, the Al content of the aluminum micropowder is greater than 98 wt%; Preferably, the particle size of the aluminum powder is less than 0.048 mm.

[0009] Preferably, the carbon black has a C content greater than 95 wt%; Preferably, the carbon black has a particle size of less than 0.078 mm.

[0010] Preferably, the B4C content of the boron carbide micro powder is greater than 98 wt%. Preferably, the boron carbide micro powder has a particle size of less than 0.048 mm.

[0011] Preferably, the recycled chopped carbon fibers have a single filament diameter of 5-10 μm, an aspect ratio of 2:1-10:1, a carbon content greater than 96 wt%, and a fineness of 50-1500 mesh.

[0012] In this invention, the aspect ratio of the recycled short-cut carbon fibers is controlled to be 2:1-10:1, which can ensure that the strength, toughness and thermal shock resistance of Al2O3-C skateboard refractory materials are significantly improved.

[0013] Preferably, the organic dispersant is an organic dispersant containing amino, ether bonds and phosphate ester groups; Preferably, the organic dispersant is obtained by copolymerizing acrylamide, polyethylene glycol methacrylate, and phosphate 2-hydroxyethyl methacrylate.

[0014] In this invention, compared to general dispersants, the dispersant contains amino groups, which have a certain degree of polarity and alkalinity, and can provide additional charge to the dispersant, promoting the stability of the dispersion system; the dispersant contains ether bonds, which can enhance the flexibility of the dispersant, making it better adaptable to carbon fibers of different sizes, thereby improving the dispersion effect; the dispersant contains phosphate ester groups, which can provide a large amount of negative charge, enhance the charge shielding effect of the dispersant, further improve the stability of the dispersant system, reduce the viscosity of the mixed solution, and improve the fluidity.

[0015] Preferably, before mixing the recycled chopped carbon fibers with the dispersant solution, the recycled chopped carbon fibers are further screened. Preferably, the sieving specifications include 50 mesh, 100 mesh, 500 mesh and 1500 mesh.

[0016] Preferably, the firing process includes: first drying at 180-240℃ for 24-38 hours, and then firing at 580-800℃ in a char-filled atmosphere for 24-38 hours.

[0017] This invention proposes a high-strength, high-toughness, low-carbon Al2O3-C refractory material for skateboards, which incorporates carbon fibers and is prepared using the above-mentioned method.

[0018] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: (1) The preparation method of the present invention mainly involves conventional mixing, molding, heat treatment, etc. The process is simple and easy to achieve mass production. In addition, the plate-shaped corundum particles and fine powder, carbon black, metallic aluminum powder, boron carbide micro powder, phenolic resin, organic dispersant solution and recycled short carbon fiber used in the present invention are all raw materials used in conventional industrial production. The proportion of recycled short carbon fiber and organic dispersant solution added is relatively low, and the overall cost of raw materials is relatively low. Therefore, the present invention has the advantages of simple process and low production cost.

[0019] (2) This invention replaces the addition of other forms of carbon by combining recycled short-cut carbon fibers of different specifications (50 mesh, 100 mesh, 500 mesh and 1500 mesh), which not only gives full play to the characteristics of carbon fiber strengthening matrix, but also realizes low carbon preparation, so that the strength, toughness and thermal shock resistance of Al2O3-C sliding plate refractory material are significantly improved.

[0020] (3) The present invention uses recycled short-cut carbon fiber to replace the addition of flake graphite and part of carbon black, and the carbon fiber can be uniformly dispersed in the matrix through the action of organic dispersant. The organic dispersant can be decomposed without residue at high temperature. Not only is the process simple, but it also avoids the increase of carbon content and the introduction of impurities, thus achieving the effect of strengthening Al2O3-C slide plate refractory material and reducing the carbon content of Al2O3-C slide plate refractory material.

[0021] (4) The high-strength and tough low-carbon Al2O3-C refractory material prepared by the present invention can slide 4-6 times in practical applications. Compared with similar products, it has reduced wear and cracking behavior under the same number of uses, and has a longer service life. It avoids the waste of raw materials and energy in production, improves production efficiency and safety, and helps to reduce costs and increase efficiency in industrial production.

[0022] (5) The method described in this invention has the characteristics of low raw material cost, simple process and uniform carbon fiber dispersion. The high strength and toughness low carbon Al2O3-C refractory material prepared by this method has the advantages of excellent mechanical properties at room temperature and high temperature, low carbon content, good thermal shock resistance and good oxidation resistance. Attached Figure Description

[0023] Figure 1 The image shows the SEM image of the high-strength, low-carbon Al2O3-C refractory material for skateboards described in Example 1. Detailed Implementation

[0024] The present invention will now be described in detail through specific embodiments. However, these embodiments are clearly provided for illustrative purposes and are not intended to limit the scope of the present invention.

[0025] In the following embodiments: The Al2O3 content of the tabular alumina is greater than 98 wt%; the tabular alumina includes tabular alumina particles and tabular alumina fine powder, the particle size of the tabular alumina particles is 0.048-2 mm, and the particle size of the tabular alumina fine powder is less than 0.048 mm; the weight ratio of the tabular alumina particles to the tabular alumina fine powder is 3:1. The aluminum micro powder has an Al content greater than 98 wt% and a particle size less than 0.048 mm. The carbon black has a C content greater than 95 wt% and a particle size less than 0.078 mm. The boron carbide micro powder has a B4C content greater than 98 wt% and a particle size less than 0.048 mm. The recycled short-cut carbon fiber monofilaments have a diameter of 5-10 μm, an aspect ratio of 2:1-10:1, a carbon content greater than 96 wt%, and a fineness of 50-1500 mesh.

[0026] Example 1 This embodiment proposes a method for preparing a high-strength, high-toughness, low-carbon Al2O3-C sliding plate refractory material, including the following steps: (1) Prepare the following raw materials by weight percentage: 83wt% tabular corundum, 7wt% metallic aluminum powder, 2wt% carbon black, 2.5wt% boron carbide powder, 4.5wt% liquid phenolic resin, 0.5wt% recycled short-cut carbon fiber, and 0.5wt% organic dispersant solution (N-2002, Zschimmer & Schwarz Chemical Group). (2) After screening the recycled short carbon fibers, short carbon fibers of different specifications of 50 mesh, 100 mesh, 500 mesh and 1500 mesh are obtained; (3) Add the recycled short carbon fibers of different specifications directly into the organic dispersant solution and stir to mix evenly to obtain a mixed solution in which the recycled short carbon fibers are fully dispersed. (4) After uniformly mixing the tabular corundum, metallic aluminum micro powder, carbon black, boron carbide powder, and liquid phenolic resin, the mixture is stirred and mixed with the aforementioned solution. The resulting uniform mixture is pressed and molded to obtain an Al2O3-C slide plate blank. It is then air-dried for 18 hours, dried at 200°C for 30 hours, and then fired at 700°C in a buried carbon atmosphere for 30 hours. After cooling, the high-strength, high-toughness, low-carbon Al2O3-C slide plate refractory material is obtained, and its microstructure is as follows: Figure 1 As shown.

[0027] Example 2 This embodiment proposes a method for preparing a high-strength, high-toughness, low-carbon Al2O3-C sliding plate refractory material, including the following steps: (1) Prepare the following raw materials by weight percentage: 80wt% tabular corundum, 10wt% metallic aluminum powder, 0.5wt% carbon black, 5wt% boron carbide powder, 3wt% liquid phenolic resin, 1wt% recycled short-cut carbon fiber, and 0.5wt% organic dispersant solution (N-2002, Zschimmer & Schwarz Chemical Group). (2) After screening the recycled short carbon fibers, short carbon fibers of different specifications of 50 mesh, 100 mesh, 500 mesh and 1500 mesh are obtained; (3) Add the recycled short carbon fibers of different specifications directly into the organic dispersant solution and stir to mix evenly to obtain a mixed solution in which the recycled short carbon fibers are fully dispersed. (4) After mixing the tabular corundum, metallic aluminum micro powder, carbon black, boron carbide powder and liquid phenolic resin evenly, the mixture is stirred and mixed with the mixed solution. The resulting uniform mixture is pressed and molded to obtain an Al2O3-C slide plate blank, which is then placed in the air to dry for 12 hours, dried at 180°C for 38 hours, and then fired at 580°C in a buried carbon atmosphere for 38 hours. After cooling, the high-strength, tough, low-carbon Al2O3-C slide plate refractory material is obtained.

[0028] Example 3 This embodiment proposes a method for preparing a high-strength, high-toughness, low-carbon Al2O3-C sliding plate refractory material, including the following steps: (1) Prepare the following raw materials by weight percentage: 88wt% tabular corundum, 4wt% metallic aluminum powder, 1wt% carbon black, 0.7wt% boron carbide powder, 5.5wt% liquid phenolic resin, 0.3wt% recycled short-cut carbon fiber, and 0.5wt% organic dispersant solution (N-2002, Zschimmer & Schwarz Chemical Group). (2) After screening the recycled short carbon fibers, short carbon fibers of different specifications of 50 mesh, 100 mesh, 500 mesh and 1500 mesh are obtained; (3) Add the recycled short carbon fibers of different specifications directly into the organic dispersant solution and stir to mix evenly to obtain a mixed solution in which the recycled short carbon fibers are fully dispersed. (4) After mixing the tabular corundum, metallic aluminum micro powder, carbon black, boron carbide powder and liquid phenolic resin evenly, the mixture is stirred and mixed with the mixed solution. The resulting uniform mixture is pressed and molded to obtain an Al2O3-C slide plate blank, which is then placed in the air to dry for 24 hours, dried at 240°C for 24 hours, and then fired at 800°C in a buried carbon atmosphere for 24 hours. After cooling, the high-strength, tough, low-carbon Al2O3-C slide plate refractory material is obtained.

[0029] Example 4 This embodiment proposes a method for preparing a high-strength, high-toughness, low-carbon Al2O3-C sliding plate refractory material, including the following steps: (1) Prepare the following raw materials by weight percentage: 83wt% tabular corundum, 7wt% metallic aluminum powder, 2wt% carbon black, 2.5wt% boron carbide powder, 4.5wt% liquid phenolic resin, 0.5wt% recycled short-cut carbon fiber, and 0.5wt% organic dispersant solution; The organic dispersant solution is prepared by the following method: acrylamide, polyethylene glycol methacrylate, and 2-hydroxyethyl methacrylate phosphate are added to water and mixed, then potassium persulfate is added. The mass ratio of acrylamide, polyethylene glycol methacrylate, 2-hydroxyethyl methacrylate phosphate, and potassium persulfate is 1:1.5:2:0.1. The mixture is heated to 90°C and stirred for 3 hours. After vacuum distillation, the organic dispersant solution is obtained. (2) After screening the recycled short carbon fibers, short carbon fibers of different specifications of 50 mesh, 100 mesh, 500 mesh and 1500 mesh are obtained; (3) Add the recycled short carbon fibers of different specifications directly into the organic dispersant solution and stir to mix evenly to obtain a mixed solution in which the recycled short carbon fibers are fully dispersed. (4) After mixing the tabular corundum, metallic aluminum micro powder, carbon black, boron carbide powder and liquid phenolic resin evenly, the mixture is stirred and mixed with the mixed solution. The resulting uniform mixture is pressed and molded to obtain an Al2O3-C slide plate blank, which is then placed in the air to dry for 18 hours, dried at 200°C for 30 hours, and then fired at 700°C in a buried carbon atmosphere for 30 hours. After cooling, the high-strength, tough, low-carbon Al2O3-C slide plate refractory material is obtained. Comparative Example 1 This comparative example proposes a method for preparing Al2O3-C skateboard refractory material, specifically referring to Example 1, except that recycled short-cut carbon fibers are not added, i.e. steps (2) and (3) are omitted. Comparative Example 2 This comparative example proposes a method for preparing Al2O3-C skateboard refractory material. Specifically, refer to Example 1. In addition to using long carbon fibers, in step (2), long carbon fibers (with a single filament diameter of 5-10μm, a carbon content of more than 96wt%, and an aspect ratio of 15:1-20:1) are used instead of recycled short carbon fibers. Comparative Example 3 This comparative example proposes a method for preparing Al2O3-C refractory material, specifically referring to Example 1. Except that no organic dispersant solution is added, in step (1), the following raw materials by mass percentage are prepared: 83.5wt% of tabular corundum, 7wt% of metallic aluminum powder, 2wt% of carbon black, 2.5wt% of boron carbide powder, 4.5wt% of liquid phenolic resin, and 0.5wt% of recycled short-cut carbon fiber. Comparative Example 4 This comparative example presents a method for preparing Al2O3-C sliding plate refractory material. Specifically, refer to Example 4. Except for step (1), the organic dispersant solution is prepared by the following method: Polyethylene glycol methacrylate and 2-hydroxyethyl methacrylate phosphate were added to water and mixed well. Then potassium persulfate was added. The mass ratio of polyethylene glycol methacrylate, 2-hydroxyethyl methacrylate phosphate and potassium persulfate was 1.5:2:0.1. The mixture was heated to 90°C and stirred for 3 hours. After vacuum distillation, the organic dispersant solution was obtained. The refractory materials obtained in the examples and comparative examples were tested respectively: the bulk density and apparent porosity were tested according to the national standard GB / T2997-2015; the room temperature compressive strength was tested according to the national standard GB / T 5072-2008; the room temperature flexural strength was tested according to the national standard GB / T3001-2017; the high temperature flexural strength was tested according to the national standard GB / T3002-2017; the thermal shock resistance was tested according to the national standard GB / T30873-2014, and the thermal shock resistance test was conducted using the 1100℃ water cooling method; the oxidation resistance was tested according to the national standard GB / T17732-2008, and the decarburized layer thickness was tested after the 1400℃ high temperature oxidation resistance test; the specific results are shown in Table 1.

[0030] Table 1 shows the performance of the refractory materials described in the examples and comparative examples.

[0031] As shown in Table 1 above, the Al2O3-C sliding plate refractory materials described in Examples 1-4 of this invention not only have high strength, good toughness, and long service life, but also have the advantages of low carbon content, excellent thermal shock resistance, and excellent erosion resistance. Furthermore, Example 4 shows that, compared to general organic dispersants, organic dispersants containing amino, ether, and phosphate groups have a better improvement effect on Al2O3-C sliding plate refractory materials. Comparative Example 1 shows that when the addition of recycled short-cut carbon fibers is omitted, the strength, toughness, thermal shock resistance, and erosion resistance all decrease significantly. Comparative Example 2 shows that, compared to general long carbon fibers, low-cost recycled short-cut carbon fibers have a better performance improvement effect on Al2O3-C sliding plate refractory materials. Meanwhile, Comparative Example 3 shows that even with the addition of recycled short-cut carbon fibers, without prior dispersion pretreatment, the performance improvement effect of the resulting sliding plate refractory material is limited. Comparative Example 4 shows that organic dispersants containing only ether and phosphate groups do not have a superior performance improvement effect on Al2O3-C sliding plate refractory materials compared to general organic dispersants.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a high-strength, high-toughness, low-carbon Al2O3-C refractory material for sliding plates incorporating carbon fibers, characterized in that, Includes the following steps: S1. Prepare the following raw materials by weight percentage: 75-90 wt% tabular corundum, 4-10 wt% metallic aluminum powder, 0.5-3 wt% carbon black, 0.5-5 wt% boron carbide powder, 3-6 wt% liquid phenolic resin, 0.1-1 wt% recycled short-cut carbon fiber, and 0.45-0.85 wt% organic dispersant; S2. Mix the recycled short-cut carbon fibers with the organic dispersant solution to obtain a mixed solution in which the recycled short-cut carbon fibers are fully dispersed. S3. After mixing the tabular corundum, metallic aluminum micro powder, carbon black, boron carbide powder and liquid phenolic resin, mix them with the mixed solution described in step S2. The resulting uniform mixture is pressed and sintered to obtain the high-strength, tough, low-carbon Al2O3-C sliding plate refractory material.

2. The preparation method of the high-strength and high-toughness low-carbon Al2O3-C sliding plate refractory material incorporating carbon fibers according to claim 1, characterized in that, The Al2O3 content of the tabular corundum is greater than 98 wt%; Preferably, the tabular alumina includes tabular alumina particles and tabular alumina fine powder, wherein the particle size of the tabular alumina particles is 0.048-2 mm, and the particle size of the tabular alumina fine powder is less than 0.048 mm. Preferably, the mass ratio of the tabular corundum particles to the tabular corundum fine powder is 2:1-4:

1.

3. The preparation method of the high-strength, high-toughness, low-carbon Al2O3-C refractory material incorporating carbon fibers according to claim 1 or 2, characterized in that, The aluminum micropowder contains more than 98 wt% Al. Preferably, the particle size of the aluminum powder is less than 0.048 mm.

4. The method for preparing the high-strength, high-toughness, low-carbon Al2O3-C refractory material incorporating carbon fibers according to any one of claims 1-3, characterized in that, The carbon black has a C content greater than 95 wt%; Preferably, the carbon black has a particle size of less than 0.078 mm.

5. The method for preparing the high-strength, high-toughness, low-carbon Al2O3-C refractory material incorporating carbon fibers according to any one of claims 1-4, characterized in that, The boron carbide micro powder has a B4C content greater than 98 wt%. Preferably, the boron carbide micro powder has a particle size of less than 0.048 mm.

6. The method for preparing the high-strength, low-carbon Al2O3-C refractory material incorporating carbon fibers according to any one of claims 1-5, characterized in that, The recycled chopped carbon fibers have a single filament diameter of 5-10 μm, an aspect ratio of 2:1-10:1, a carbon content greater than 96 wt%, and a fineness of 50-1500 mesh.

7. The method for preparing the high-strength, high-toughness, low-carbon Al2O3-C refractory material incorporating carbon fibers according to any one of claims 1-6, characterized in that, The organic dispersant is an organic dispersant containing amino, ether bonds and phosphate ester groups; Preferably, the organic dispersant is obtained by copolymerizing acrylamide, polyethylene glycol methacrylate, and phosphate 2-hydroxyethyl methacrylate.

8. The method for preparing the high-strength, high-toughness, low-carbon Al2O3-C refractory material incorporating carbon fibers according to any one of claims 1-7, characterized in that, Before mixing the recycled short-cut carbon fibers with the dispersant solution, the recycled short-cut carbon fibers are also screened. Preferably, the sieving specifications include 50 mesh, 100 mesh, 500 mesh and 1500 mesh.

9. The method for preparing the high-strength, high-toughness, low-carbon Al2O3-C refractory material incorporating carbon fibers according to any one of claims 1-8, characterized in that, The firing process includes: first drying at 180-220℃ for 24-38 hours, and then firing at 580-800℃ in a char-filled atmosphere for 24-38 hours.

10. A high-strength, low-carbon Al2O3-C refractory material for skateboards incorporating carbon fibers, characterized in that, It is prepared by the preparation method described in any one of claims 1-9.

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